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<?php var_export( array_merge( ['x' => 'X', 5 => 'five'], ['y' => 'Y', 5 => 'FIVE']));
Output for rfc.property-hooks, git.master, git.master_jit
array ( 'x' => 'X', 0 => 'five', 'y' => 'Y', 1 => 'FIVE', )

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